package com.zzw.hotspot;

import java.io.IOException;
import java.io.InputStream;

public class ClassLoaderTest {
    public static void main(String[] args) {
        ClassLoader myLoader = new ClassLoader() {
            @Override
            public Class<?> loadClass(String name) throws ClassNotFoundException {
                String fileName = name.substring(name.lastIndexOf(".") + 1) + ".class";
                InputStream is = getClass().getResourceAsStream(fileName);
                if(is == null){
                    return super.loadClass(name);
                }
                try {
                    byte[] b = new byte[is.available()];
                    is.read(b);
                    return  defineClass(name,b,0,b.length);
                } catch (IOException e) {
                    e.printStackTrace();
                    throw  new ClassNotFoundException(name);
                }
            }
        };
        try {
            Object obj = myLoader.loadClass("com.zzw.hotspot.ClassLoaderTest").newInstance();
            System.out.println(obj.getClass());
            System.out.println(obj instanceof ClassLoaderTest);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
